Embassy of Death is unity of thantos to save human souls after they dead. Thantos in this story is not a name, it's a type of grim reaper who not absorb human soul. they just bring the soul into Land of the dead(that's just like a good grim reaper lol). every Ambassador from Embassy of Death have title "Lord Hades" that's not same mean with Hades from Greek mythology, but the same thing is they are a master from land of the dead.